Stratiodrilus circensis Steiner & Amaral 1999
Creators: name: Daudt, Luiz C. C.
name: Amato, José F. R.
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Histriobdellidae
Stratiodrilus
Stratiodrilus circensis

description: Stratiodrilus circensis Steiner & Amaral, 1999
(Figs. 1–12)
Description (based on 82 mounted specimens)
Male (n = 28) (Figs. 1, 3–4): 730–1230 in total body length (892.4; 125.2). Head 100–180 long (143.7; 16.7) with five antennae; median antenna (T1) as long as the first lateral pair (T2), both unsegmented; second lateral pair (T3) bisegmented, twice as long as the length of T2. Three pairs of lateral, unsegmented cirri (C1, C2, C3) a little longer than T2 length, with a pair of posterior cirri (C4) as long as C1-C3 length, with adjacent, conical ventral lobes (Lb), half, shorter or as long as C4; each posterior locomotor appendage with two tubercles (Tu). Posterior locomotor appendages (Pl) 349.6–580 long (450.3; 50.5). Jaw apparatus (Ja) 77.7– 160.9 long (114.1; 22.7) not reaching the limit with the first trunk segment; fulcrum (Fu) 30–100 long (62.2; 19.3). Penis (Pe) 38.8–122.1 long (71.0; 19.2; n = 22). Claspers (Cl) 83.2–88.8 long (86.0; 3.9; n = 2). Female (n = 25) (Figs. 2, 5–6): 710.4–1120 in total body length (864.7; 97.2). Head 127.6–180 (142.4; 12.8) long. Birth pores (Bp) immediately behind C3 (Fig. 2). Posterior locomotor appendages 344.1–540 long (443.6; 44.4). Jaw apparatus 77.7–150 long (112.2; 16.7); fulcrum 33.3–100 long (60.3; 16). Number of eggs (Eg) per female, 0–5.
Host: Aegla leptodactyla Buckup & Rossi, 1977.
Hosts deposited: Coleção de Crustáceos UFRGS Nº 4119 to 4147. The type host specimen as well as two other specimens of A. schmitti, collected from Rio Piraquara, State of Paraná, were deposited in the same collection under Nº 4175.
Site of infestation: Branchial chamber.
Locality: Rio da Divisa, locality of Silveira, Municipality of São José dos Ausentes, RS, Brazil (28º38’17”S, 049º57’46”W).
Prevalence: 70%.
Intensity of infestation: 1 to 41 (arithmetic mean 13.3; SD 10.4).
Deposited specimens: Ex. A. leptodactyla - adult male CHIOC Nº 36.837 (SBA 1907-2-11); adult female CHIOC Nº 36.838 (SBA 1910-2-19); juvenile male CHIOC Nº 36.839 (SBA 1907-2-3); juvenile female CHIOC Nº 36.840 (SBA 1910-2-5); adult male INPA Nº 127 (SBA 1907-2-12); adult female INPA Nº 128 (SBA 1907-2-4); juvenile male INPA Nº 129 (SBA 1907-2-13); juvenile female INPA Nº 130 (SBA 1907-2- 14); and juvenile male MZUEC Nº 150 (SBA 1907-2-18); adult female MZUEC Nº 151 (SBA 1907-2-1); adult male MZUEC Nº 152 (SBA 1907-2-6); juvenile female MZUEC Nº 153 (SBA 1910-2-9). Ex. A. schmitti - adult male MZUEC Nº 154 (SBA 2084-2-1) and adult female MZUEC Nº 155 (SBA 2084-2-3).
Specimens examined: 11 specimens of S. circensis (mounted in toto) from Rio Carvalho, collected from the branchial chamber of A. schmitti.
description: Published as part of Daudt, Luiz C. C. & Amato, José F. R., 2007, Morphological variation of Stratiodrilus circensis (Polychaeta, Histriobdellidae) from a new host, Aegla leptodactyla (Crustacea, Anomura, Aeglidae) with identification of its type host species *, pp. 57-62 in Zootaxa 1450 on pages 58-60, DOI: 10.5281/zenodo.176233