Psammokalliapseudes mirabilis Lang 1956
Creators: name: DRUMM, DAVID T.
name: HEARD, RICHARD W.
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Tanaidacea
Kalliapseudidae
Psammokalliapseudes
Psammokalliapseudes mirabilis

description: Psammokalliapseudes mirabilis Lang, 1956   
 Psammokalliapseudes mirabilis Lang, 1956a: 252–257, Figs. 1–20, Pl. 1, 1956c: 205, 217. Brum, 1974: 4. Gardiner, 1975: 203. Băcescu, 1979: 3. Băcescu and Absalao, 1985: 53.   
 Type material. Holotype: female with oostegites, 2.47 mm (SMNH); paratypes: 2 adult females (SMNH 7718).   
 Material examined. Paratypes: 2 adult females (SMNH 7718), Brasil, Santos, 23°58'S, 046°20'W, fine sand, Leg. Gerlach, 20 Apr., 1954.   
 Diagnosis. Rostrum triangular. Pereonites 3 and 4 with anteriorly projected anterolateral apophyses. Antennule with three articulate inner flagellum. Antenna with plumose setae coming off squama. Labial palp with two terminal spiniform setae. Cheliped with row of plumose setae on ventral margin of basis and merus; exopodite with four plumose setae. Pereopod 1 with row of plumose setae on dorsal margin of merus, carpus and propodus; dactylus with distal setose projection adjacent to unguis; exopodite with six plumose setae. Pereopod 6 propodus with spiniform setae on ventral and dorsal margins.   
 Type locality. Santos, Brazil, littoral (Fig. 97).   
 Geographic distribution. Known from type locality only.   
 Remarks. Males are unknown in this species.   
  Genus Tanapseudes B  ă cescu, 1978   
 Tanapseudes Băcescu, 1978: 209. Bamber, 2000: 50. Guţu, 2001: 65, 67–70. Hansknecht et al., 2002: 67. Guţu and Angsupanich, 2005: 51.   
 Type species. Tanapseudes ormuzana Băcescu, 1978.   
 Diagnosis. Modified after Hansknecht et al., 2002.   
Body small, length less than 5 mm, lacking hyposphenia, pereonite shape showing sexual dimorphism. Carapace longer than wide, without eyes. Rostrum large and rounded. Antennule with vestigial, uniarticulate inner flagellum; outer flagellum three–articled, one aesthetasc on articles one and three; no sexual dimorphism. Antenna peduncle article 1 without medial extension; squama bearing two long simple setae. Mandibular palp uniarticulate, bearing one simple seta. Maxillule lacking palp. Cheliped and pereopod 1 lacking exopodite. Cheliped sexually dimorphic with female fixed finger triangular and shortened. Pereopod 1 with bifurcate seta on outer margin of dactylus. Pereopod 6 with two plumose setae on dorsal margin of merus. At least one pereonite with glandular–like cluster. Four pairs of oostegites on pereopods 1–4. Five pairs of pleopods. Uropod exopodite with three articles.  
 Remarks. Guţu and Angsupanich (2005) recognized the difficulty of distinguishing the species of Tanapseudes. The three species show extreme morphological similarity indeed so it would be interesting to examine how much genetic divergence they have between them.   
 Guţu and Angsupanich (2005) used the length/width ratio of pereonites three and four in their key to the species of Tanapseudes to differentiate T. ormuzana from T. sinensis. However, we believe they probably examined different sexes of the two species because pereonite shape exhibits sexual dimorphism. The females have longer pereonites than the males, presumably as an adaptation to accommodate the eggs and developing embryos.
description: Published as part of DRUMM, DAVID T. & HEARD, RICHARD W., 2011, Systematic revision of the family Kalliapseudidae (Crustacea: Tanaidacea), pp. 1-172 in Zootaxa 3142 (1) on pages 150-151, DOI: 10.11646/zootaxa.3142.1.1, http://zenodo.org/record/6263899