蛆管螺屬

蛆管螺屬（Caecum）是微小海螺的一屬、海洋腹足綱的微型軟體動物，屬於蛆管螺科，也是蛆管螺科的模式屬。

**分佈**
這個屬在全世界的溫暖海洋（溫帶海洋性氣候地域）出現。大部分物種生活在海綿、珊瑚礁的沙地或海灣，在海灣及潟湖淺水區的海藻床帶，例如常見的美麗Caecum pulchellum。不過牠們微小的體型亦使之容易被忽略。部分物種被認為是不常見的，這種評估可能是缺乏適當抽樣的結果。

**形態描述**
如同其他蛆管螺科物種，蛆管螺屬的體型微小，殼長介乎2 mm到6 mm；螺殼顏色白到淺黃，而且大多數也薄得可以透光。雖然，其胚螺仍然是螺旋狀生長的，但其次生螺層（teleoconch）只彎成一條彎曲的角狀管；而其胚螺亦與其他蛆管螺亞科物種一樣，在成長時脫落，使整個螺殼變成了一個簡單的筒狀。
螺管在脫落了胚螺的一端會有一個鈣質的分泌物永久把螺殼封閉；而殼另一端的殼口有圓形、帶螺旋的角質螺厴掩蓋。螺殼上的裝飾若不是平滑，就是有大量密集的環形脊線組成。

**食性**
本屬物種以沙粒或鵝卵石上的單細胞生物為食。

**物種**
根據ITIS及WoRMS紀錄，本屬包括下列各物種：- † Caecum aartseni Van Dingenen, Ceulemans & Landau, 2016 - Caecum achirona (de Folin, 1867)- Caecum adamsi Raines, 2020- 截尾蛆管螺 Caecum amputatum Hedley, 1894- Caecum amydroglyptum  Rehder, 1980 - Caecum angustum  de Folin, 1879- Caecum annulatum Emmons, 1858- Caecum antillarum Carpenter, 1858 - Antillean caecum- Caecum arabicum Issel, 1869- Caecum armoricum de Folin, 1869 - De Folin's lagoon snail. This species is fully protected in the United Kingdom under the Wildlife and Countryside Act 1981 since 1992.- Caecum atlantidis  R. B. Watson, 1897 - Caecum attenuatum  de Folin, 1879 - Caecum auriculatum  de Folin, 1868 - Caecum austrafricanum Vannozzi, Pizzini & Raines, 2015- Caecum australe Pizzini & Raines, 2011- Caecum bathus Pizzini, Raines & Vannozzi, 2013 - † Caecum benhami Goedert & Raines, 2016 - † Caecum bensoni Goedert & Raines, 2016 - Caecum beaufortensis Ward and Blackwelder 1987   date = February 2011- Caecum bimamillatum de Folin, 1867- Caecum bimarginatum Carpenter, 1859- Caecum biomaglo Vannozzi, 2023- Caecum bipartitum de Folin, 1870 - Caecum borneoense de Folin, 1867- Caecum bounty Pizzini & Raines, 2011- Caecum brasilicum  de Folin, 1874 - Caecum brennani Raines & Pizzini, 2009- Caecum breve de Folin, 1867- Caecum bucerium Golikov, 1967- Caecum californicum Dall, 1885 - California caecum - Caecum calvertense  Martin, 1904  date=February 2011- Caecum campanulatum Raines & Pizzini, 2005- Caecum campe  Pilsbry and Olsson, 1941  date = February 2011- Caecum carolinianum Dall, 1892 - Carolina caecum   - † Caecum carpenteri Deshayes, 1861 - Caecum caverna  Moolenbeek, Faber & Iliffe, 1989 - Caecum chilense  Stuardo, 1962  - Caecum chinense  de Folin, 1879 - Caecum chipolanum  Gardner, 1947  - Caecum cinctum Olsson & Harbison, 1953- Caecum circumvolutum de Folin, 1867- Caecum clarkii  P. P. Carpenter, 1858 - Caecum clarum Lamy, 1910 ex de Folin MS- Caecum clathratum  P. P. Carpenter, 1857  - Caecum clava de Folin, 1867 - club caecum - Caecum cocoense Sibaja-Cordero, García-Méndez & Troncoso, 2013- Caecum codoceoae Gálvez & Huidobro, 2017- Caecum condylum Moore, 1969 - bone caecum- Caecum continens  Van der Linden & Moolenbeek, 2000  - Caecum cooki Pizzini & Raines, 2011- Caecum cooperi S. I. Smith, 1860 - Cooper's Atlantic caecum- Caecum corrugatulum Carpenter, 1857- Caecum crassum de Folin, 1870- Caecum crebricinctum Carpenter, 1864 - many-named caecum - Caecum crispum A. E. Verrill & Bush, 1900  - Caecum crystallinum de Folin, 1880- Caecum cubitatum (de Folin, 1868) - smooth caecum date=February 2011- Caecum cuspidatum Chaster, 1896  - Caecum cycloferum de Folin, 1867 - fatlip caecum   - Caecum dakuwaqa Pizzini, Raines & Vannozzi, 2013 - Caecum dalli Bartsch, 1920- Caecum danielei Pizzini & Raines, 2011- Caecum debile A. E. Verrill & Bush, 1900- Caecum delicatulum A. E. Verrill & Bush, 1900- Caecum derjugini Golikov, 1967- Caecum dextroversum  P. P. Carpenter, 1858 - Caecum digitulum Hedley, 1904 - Caecum diminutum  C. B. Adams, 1852 - Caecum directum Vannozzi, 2019- Caecum donmoorei Mitchell-Tapping, 1979 - Caecum draperi Raines, 2020- Caecum dux de Folin, 1871- Caecum eburneum  C. B. Adams, 1852  - Caecum egenum Vannozzi, 2017- Caecum elegantissimum Carpenter, 1859- Caecum eliezeri Absalao, 1997 - Caecum elongatum  P. P. Carpenter, 1857 - Caecum engli  Nofroni, Pizzini, Oliverio, 1997 - Caecum eunoi  Nofroni, Pizzini, Oliverio, 1997 - Caecum exile  de Folin, 1875 - Caecum farcimen  P. P. Carpenter, 1857 - Caecum fijiense Pizzini, Raines & Vannozzi, 2013 - Caecum firmatum  C. B. Adams, 1852  - Caecum floridanum Stimpson, 1851 - Florida caecum- Caecum folini Kisch, 1959 - Caecum frugi Vannozzi, 2019- Caecum galapagoense Raines, 2020- Caecum geigeri Pizzini & Raines, 2011- 蛆管螺 Caecum glabellum A. Adams, 1868- Caecum glabriforme Carpenter, 1857- Caecum glabrum (Montagu, 1803)- Caecum gofasi Pizzini & Nofroni, 2001- Caecum granulatum Vannozzi, 2019- Caecum greensboroense  Martin, 1904  date=February 2011- Caecum gulosum Hedley, 1899- Caecum gurgulio Carpenter, 1858 - windpipe caecum   - Caecum hemphilli Bartsch, 1920 date = February 2011 - Caecum heptagonum (Bartsch, 1920)- Caecum heterochromum Raines & Pizzini, 2005- Caecum hyalinum Vannozzi, 2022- Caecum imbricatum Carpenter, 1858 - imbricate caecum - Caecum incisum Vannozzi, Pizzini & Raines, 2015 - Caecum imperforatum Kanamacher, 1798    (nomen dubium)- Caecum inclinatum de Folin, 1869- Caecum infimum de Folin, 1867- Caecum inflatulum Vannozzi, 2017- Caecum inflatum de Folin, 1867- Caecum inhacaense Albano & Pizzini 2011- Caecum insculptum Carpenter, 1857- Caecum insularum Moore, 1969    - Caecum intortum Vannozzi, Pizzini & Raines, 2015- Caecum invisibile Egger & Jörger, 2020- Caecum iricolor Vannozzi, 2023- Caecum japonicum (Habe, 1978)- Caecum johnsoni Winkley, 1908- Caecum jonatani Espinosa, Ortea & Fernandez-Garcés, 2007- Caecum jonesae Swinnen & Simone, 2024- Caecum jucundum de Folin, 1867- Caecum knysnaense Vannozzi, Pizzini & Raines, 2015- Caecum kontiki Pizzini & Raines, 2011- Caecum laeve C.B. Adams, 1852- Caecum lapita Pizzini, Raines & Vannozzi, 2013 - Caecum laqueatum  C. B. Adams, 1852 - † Caecum larieyense Lozouet, Lesport & Renard, 2001 - Caecum leilae Vannozzi, Pizzini & Raines, 2015- Caecum lightfootanum Raines, 2020- Caecum limnetes Long, 1972- Caecum limpidum de Folin, 1874- Caecum lindae Vannozzi, Pizzini & Raines, 2015- Caecum lineicinctum de Folin, 1880- Caecum liratocinctum Carpenter, 1857- Caecum lohri Strong & Hertlein, 1939- Caecum loyaltense Pizzini, Raines & Vannozzi, 2013 - Caecum lozoueti Vannozzi & Renda, 2024- Caecum lucidum de Folin, 1867- Caecum macrum  Van der Linden & Moolenbeek, 2000 -  Caecum maestratii Pizzini, Raines & Vannozzi, 2013  - Caecum magellanicum di Geronimo, Privitera & Valdovinos, 1995- Caecum malleatum de Folin, 1867- † Caecum mammillatum S. V. Wood, 1848 - Caecum maori Pizzini & Raines, 2006- Caecum maraisi Vannozzi, Pizzini & Raines, 2015- Caecum marginatum de Folin, 1869- Caecum marmoratum de Folin, 1869- Caecum massambabense  Absalao, 1994 - Caecum mauritianum de Folin, 1867- Caecum metamorphosicum S. Lima, Santos & Absalão, 2013- Caecum microannulatum Vannozzi & Renda, 2024- Caecum microstriatum Pizzini, Raines & Vannozzi, 2013 - Caecum miliarium Vannozzi & Renda, 2024- † Caecum mineuri Lozouet, 1999 - Caecum mirificum  de Folin, 1867 - Caecum modestum de Folin, 1867- Caecum monstrosum  C. B. Adams, 1852- Caecum moorei (Marincovich, 1973)- Caecum morgan Vannozzi, Pizzini & Raines, 2015- Caecum multicostatum de Folin, 1867-  Caecum musorstomi Pizzini, Raines & Vannozzi, 2013 - Caecum nasutum Vannozzi, 2019- † Caecum nemoralis Lozouet, 2015 - Caecum neocaledonicum de Folin, 1867- Caecum neoguineanum Vannozzi, 2019- Caecum nofronii Vannozzi, 2019- Caecum oahuense  H. A. Pilsbry, 1921  - Caecum obtusum Carpenter, 1857- Caecum occidentale (Bartsch, 1920) - western caecum   - Caecum orcutti (Dall, 1885)- Caecum paradoxum  de Folin, 1867 - Caecum parvum  C. B. Adams, 1852  - Caecum pascuanum Raines & Pizzini, 2005- † Caecum pertenuis Laws, 1941 - Caecum planum de Folin, 1874- Caecum patuxentium Martin, 1904  date = February 2011- Caecum plicatum Carpenter, 1858 - plicate caecum   - Caecum pollicare Carpenter, 1859- Caecum praegrande Vannozzi, 2017- Caecum profundicolum Bartsch, 1920 - deepwater caecum date = February 2011- Caecum properegulare Mansfield, 1925   date = February 2011- Caecum pulchellum Stimpson, 1851 - beautiful caecum - Caecum pygmaeum  C. B. Adams, 1852 - Caecum quadratum  P. P. Carpenter, 1857 - Caecum rapanuiense Raines & Pizzini, 2005- Caecum regulare Carpenter, 1858- Caecum rehderi Raines & Pizzini, 2005- Caecum restrictum Vannozzi & Renda, 2024- Caecum reversum Carpenter, 1857- Caecum richthofeni  A. M. Strong & J. G. Hertlein, 1939 - Caecum rijgersmai  Jong & Coomans, 1988 - † Caecum roederi Raines, C. L. Powell & LaFollette, 2023 - Caecum rolani Pizzini & Nofroni, 2001- Caecum rosanum Bartsch, 1920 date = February 2011- Caecum rostratum de Folin, 1881- Caecum ruggerii  Pizzini, 1997   date = February 2011- Caecum rugulosum  Phil, 1836   date = February 2011- Caecum ryssotitum de Folin, 1867 - minute caecum- Caecum searleswoodii Carpenter, 1859- Caecum semilaeve Carpenter, 1857- Caecum senegambianum de Folin, 1870- Caecum sepimentum  de Folin, 1868 - Caecum shaskyi Raines, 2020- Caecum simplicissimum Thiele, 1925- Caecum sinuatum de Folin, 1867- Caecum skoglundae Pizzini, Raines & Nofroni, 2007- Caecum smriglioi Pizzini, Nofroni & Bonfitto, 2008- Caecum someri (de Folin, 1867)- Caecum spiculum Raines, 2020- Caecum striatum  de Folin, 1875- Caecum strictum de Folin, 1871- Caecum strigosum de Folin, 1868- Caecum subannulatum de Folin, 1870- Caecum subaustrale Stuardo, 1970- Caecum subconicum Carpenter, 1857- Caecum subcylindratum Pizzini, Raines & Vannozzi, 2013 - Caecum subflavum  de Folin, 1879 - Caecum subimpressum  P. P. Carpenter, 1857 - Caecum subobsoletum Carpenter, 1857- Caecum subornatum  de Folin, 1874 - Caecum subspirale Carpenter, 1857- Caecum subquadratum Carpenter, 1859- Caecum subspirale Carpenter, 1857- Caecum subvolutum de Folin, 1874- Caecum succineum  de Folin, 1879  - Caecum swinneni  Nofroni, Pizzini, Oliverio, 1997 - Caecum taeniatum de Folin, 1869- Caecum tahitianum Pizzini & Raines, 2011- Caecum temporale Vannozzi & Renda, 2024- Caecum tenue Verrill & Bush, 1900- Caecum tenuicostatum de Folin, 1881- Caecum tenuiliratum Carpenter, 1857- † Caecum tenuistriatum O. Boettger, 1869 - Caecum teres Carpenter, 1857- Caecum textile de Folin, 1867 - textile caecum- Caecum tornatum A. E. Verrill & Bush, 1900 - Caecum torquetum de Folin, 1867- Caecum tortile Dall, 1892 - twisted caecum- Caecum trachea G. Montagu, 1803 - Caecum trindadense S. Lima, Santos & Absalão, 2013- Caecum troglodyta  Moolenbeek, Faber & Iliffe, 1989 - † Caecum tumidum Carpenter, 1858 - Caecum uncinatum  de Folin, 1867 - Caecum undatum  P. P. Carpenter, 1857 - Caecum vanuatuarum Pizzini, Raines & Vannozzi, 2013 - Caecum varanoi Pizzini, Nofroni & Bonfitto, 2008- Caecum variegatum de Folin, 1867- Caecum venosum de Folin, 1867- † Caecum verai Moreno, Peñas & Rolán, 2003- Caecum vertebrale  Ch. Hedley, 1899 - Caecum vicinum de Folin, 1870- Caecum virginiae Pizzini, Raines & Vannozzi, 2013 - Caecum vitreum  P. P. Carpenter, 1858 - Caecum wakense Raines & Vannozzi, 2024- Caecum wami Raines & Pizzini, 2009- Caecum wayae Pizzini & Nofroni, 2001- Caecum zaagmani  Jong and Coomans, 1988 
亞屬異名：- Caecum (Defolinia) Weisbord, 1962: synonym of Caecum Fleming, 1813- Caecum (Meioceras) Carpenter, 1859: synonym of Meioceras Carpenter, 1859
物種異名：- Caecum abnormale Carpenter, 1857: synonym of Caecum subspirale Carpenter, 1857- Caecum amaltheanum Hedley, 1899: synonym of Mauroceras legumen (Hedley, 1899)- Caecum amamiense Habe, 1978: synonym of Mauroceras amamiense (Habe, 1978)- Caecum arcuatum   de Folin, 1867 : synonym of Caecum sepimentum de Folin, 1868- Caecum bahiahondaense  A. M. Strong & J. G. Hertlein, 1939  : synonym of Caecum clathratum Carpenter, 1857- Caecum bakeri (Bartsch, 1920): synonym of Caecum dextroversum Carpenter, 1857- Caecum berthae Lange de Morretes, 1954: synonym of Caecum plicatum Carpenter, 1858- Caecum biminicola Pilsbry, 1951: synonym of Caecum plicatum Carpenter, 1858- Caecum buccina de Folin, 1870: synonym of Caecum circumvolutum de Folin, 1867- Caecum bucheri Parenzan, 1979: synonym of Filogranula annulata (O. G. Costa, 1861)- Caecum butoti  Jong & Coomans, 1988 : synonym of Caecum marmoratum de Folin, 1869- Caecum capitanum de Folin, 1874: synonym of Caecum pulchellum Stimpson, 1851- Caecum carmenense de Folin, 1870: synonym of Caecum circumvolutum de Folin, 1867- Caecum carpenteri (Bartsch, 1920): synonym of Caecum adamsi Raines, 2020- Caecum cayoense Rehder, 1943: synonym of Caecum floridanum Stimpson, 1851- Caecum clenchi Olsson & McGinty, 1958: synonym of Caecum cycloferum de Folin, 1867- Caecum compactum P. P. Carpenter, 1857 : synonym of Caecum quadratum Carpenter, 1857- Caecum conjunctum de Folin, 1867: synonym of Caecum pulchellum Stimpson, 1851- Caecum contractum de Folin, 1870: synonym of Caecum bipartitum de Folin, 1870- Caecum corneum  R. W. Dunker, 1875 : synonym of Caecum ryssotitum de Folin, 1867- Caecum cornucopiae (Carpenter, 1858) - horn-of-plenty caecum : synonym of Meioceras cornucopiae Carpenter, 1859- Caecum coronatum de Folin, 1867: synonym of Caecum imbricatum Carpenter, 1858- Caecum coronellum Dall, 1892: synonym of Caecum cycloferum de Folin, 1867- Caecum costatum A. E. Verrill, 1872: synonym of Caecum cooperi S. I. Smith, 1860- Caecum crassicostum Gabb, 1881: synonym of Caecum floridanum Stimpson, 1851- Caecum curtatum de Folin, 1867: synonym of Caecum pulchellum Stimpson, 1851- Caecum decussatum de Folin, 1869: synonym of Caecum plicatum Carpenter, 1858- Caecum dux de Folin, 1871: synonym of Caecum floridanum Stimpson, 1851- Caecum eburneum de Folin, 1886: synonym of Caecum folini Kisch, 1959 - Caecum elagans Deregaslavtseva, 1891: synonym of Caecum trachea (Montagu, 1803)- Caecum elegans  Perejoslavitseva, 1831 : synonym of Caecum trachea (Montagu, 1803)- Caecum fasciatum de Folin, 1876: synonym of Caecum trachea (Montagu, 1803)- Caecum formulosum de Folin, 1869: synonym of Caecum imbricatum Carpenter, 1858- Caecum fulvum Kisch, 1959: synonym of Caecum neocaledonicum de Folin, 1867- Caecum heladum Olsson and Harbison, 1953 - fine-line caecum  : synonym of Caecum multicostatum de Folin, 1867- Caecum heterapex  T. Habe, 1963 : synonym of Caecum clarum Lamy, 1910 - Caecum hinoidei  T. Habe, 1978 : synonym of Caecum neocaledonicum de Folin, 1867- Caecum insigne de Folin, 1867: synonym of Caecum imbricatum Carpenter, 1858- Caecum instructum de Folin, 1870: synonym of Caecum bipartitum de Folin, 1870- Caecum irregulare de Folin, 1867: synonym of Caecum floridanum Stimpson, 1851- Caecum legumen Hedley, 1904: synonym of Meioceras legumen (Hedley, 1904)- Caecum leptoglyphos de Folin, 1881: synonym of Caecum textile de Folin, 1867- Caecum lermondi Dall, 1924: synonym of Meioceras nitidum (Stimpson, 1851)- Caecum lightfootae  Pizzini, Nofroni, Oliverio, 1994 : synonym of Caecum atlantidis Watson, 1897- Caecum lilianum  Ch. Hedley, 1903 : synonym of Caecum sepimentum de Folin, 1867- Caecum maculatum  T. Habe, 1963 : synonym of Caecum sepimentum de Folin, 1867- Caecum malleatum var. sublaevis de Folin, 1868: synonym of Caecum modestum de Folin, 1868 - Caecum microcyclus de Folin, 1879 : synonym of Caecum attenuatum de Folin, 1880 (subsequent spelling)- Caecum nitidum Stimpson, 1851 - little horn caecum: synonym of Meioceras nitidum (Stimpson, 1851)  - Caecum obesum A. E. Verrill & Bush, 1900 : synonym of Caecum plicatum Carpenter, 1858- Caecum orientale de Folin, 1868 : synonym of Caecum clarkii Carpenter, 1859- Caecum phronimum de Folin, 1867 : synonym of Caecum floridanum Stimpson, 1851- Caecum puntagordanum Weisbord, 1962: synonym of Caecum floridanum Stimpson, 1851- Caecum putnamense Mansfield, 1924 : synonym of Caecum johnsoni Winkley, 1908- Caecum rotundum de Folin, 1868 : synonym of Meioceras nitidum (Stimpson, 1851)- Caecum saavedrae Beltran, 1965 : synonym of Caecum auriculatum de Folin, 1868- Caecum sardinianum de Folin, 1869 : synonym of Caecum clarkii Carpenter, 1859- Caecum sculptum de Folin, 1881: synonym of  Caecum imbricatum Carpenter, 1858- Caecum semitracheum  S. Brusina, 1865 : synonym of Caecum clarkii Carpenter, 1859- Caecum smithi Cooper, 1872: synonym of Caecum cooperi S. Smith, 1860- Caecum solitarium  Oliver, 1915 : synonym of Caecum maori Pizzini & Raines, 2006- Caecum syriacum de Folin, 1869: synonym of Caecum auriculatum de Folin, 1868- Caecum tenue A. E. Verrill & Bush, 1900: synonym of Caecum armoricum de Folin, 1869- Caecum termes Heilprin, 1889: synonym of Caecum plicatum Carpenter, 1858- Caecum tomaculum  (Weisbord, 1962) : synonym of Caecum ryssotitum de Folin, 1867- Caecum triornatum de Folin, 1870: synonym of Caecum bipartitum de Folin, 1870- Caecum uvea Pizzini, Raines & Vannozzi, 2013: synonym of Caecum folini Kisch, 1959 - Caecum veracruzanum Collins, 1937 : synonym of Caecum circumvolutum de Folin, 1867- Caecum vestitum de Folin, 1868 - Vera Cruz caecum: synonym of Caecum circumvolutum de Folin, 1867
 疑難名：- Caecum abreviatum de Folin, 1870 - Caecum achates Sykes, 1925: taxon inquirendum- Caecum bicinctum de Folin, 1870 - Caecum gracile Carpenter, 1858 - Caecum hemisphericum de Folin, 1867 - Caecum imperforatum (Kanmacher, 1798)

**圖庫**

**參考文獻**
 Vaught, K.C. (1989). A classification of the living Mollusca. American Malacologists: Melbourne, FL (USA). 0-915826-22-4. XII, 195 pp- Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180–213- Spencer, H.; Marshall. B. (2009). All Mollusca except Opisthobranchia. In: Gordon, D. (Ed.) (2009). New Zealand Inventory of Biodiversity. Volume One: Kingdom Animalia. 584 pp- cite journal |last=van Aartsen |first=J. J. |year=1977 |title=Revision of the East Atlantic and Mediterranean Caecidae |jounal=Basteria |volume=41 |issue=1/4 |pages=7-19 |language=en

**外部連結**
  Moore, Donald R., The Systematic Position of the Family Caecidae (Mollusca: Gastropoda) , Bulletin of Marine Science, Volume 12, Number 4, 1962 ,pp. 695-701(7)-  Moore, Donald R., Ecological and Systematic Notes on Caecidae from St. Croix, U.S. Virgin Islands, Bulletin of Marine Science, Volume 22, Number 4, December 1972 , pp. 881-899(19) - Powell A. W. B., New Zealand Mollusca, 哈珀柯林斯, Auckland, New Zealand 1979 0-00-216906-1-  Shell-bearing Mollusca: : Caecidae-  Malacolog Version 4.1.0 : A Database of Western Atlantic Marine Mollusca-  The Paleobiology Database : Classification of the Caecidae-  Goedert J.L. & Raines B.K. (2016). First Paleogene Caecidae (Gastropoda: Truncatelloidea) from the northeastern Pacific Ocean and the earliest record for the genus Caecum Fleming, 1813. Proceedings of the Biological Society of Washington. 129: 38-47