Mesokalliapseudes crassus

Mesokalliapseudes crassus (Menzies, 1953) Kalliapseudes crassus Menzies, 1953: 474–479, Fig. 17–20. Lang, 1956: 205, 207, 209, 223. Băcescu, 1961: 164. Sieg, 1982: 3. Guţu, 2006: 141. Kalliapseudes (Mesokalliapseudes) crassus. Lang, 1956: 211, 216, 217, Fig. A4. Drumm, 2003: 1, 2, 11. Mesokalliapseudes crassus. Guţu, 2006: 142. Drumm and Heard, 2007: 459–468, Figs. 1–3. Type material. Holotype female (LACM CR1950 – 076.1), paratypes (26 ovigerous hermaphrodites and two hermaphrodites with oostegites, LACM CR1950 – 076.2). Material examined. Holotype: ovigerous hermaphrodite, 8 mm, San Quintin Bay, lower (= Baja) California, Mexico, 7 Apr 1950, leg. Chas Horvath, Don Reish and R. J. Menzies (LACM CR1950 – 076.1). Paratypes: 26 ovigerous and 2 preparatory hermaphrodites, 6–7 Apr 1950, depth 1.5–4.5 m, same locality and collectors as holotype (LACM CR1950 – 076.2). Non –types (USNM 262506): SQ 13: 1 ovigerous hermaphrodite, San Quintin Bay, Baja California, Mexico, North Pacific Ocean, 22 Apr 1960, leg. J. Barnard, depth 0–13 m; SQ 28: 5 ovigerous, 2 preparatory (1 partially dissected) and 1 juvenile, San Quintin Bay, Baja California, Mexico, North Pacific Ocean, 21 Apr 1960, leg. J. Barnard, depth 5–7 m. Diagnosis (adult). Rostrum acute. Medial extension of antenna with numerous (12 or 13) plumose sete; third article with distinctive narrow, spinulate process. Cutting edge of fixed finger of cheliped with numerous (~ 10) bipectinate setae and cutting edge of dactylus with numerous (~ 11) serrate setae increasing in length distally; fixed finger more than two–thirds length of dactylus. Pereopod 6 propodus with numerous (~ 12) outer serrate spiniform setae. Hyposphaenia absent. Hermaphroditic. Type locality. San Quintin Bay, Baja California, Mexico, 0–13 m depth (Fig. 1, number 34; Fig. 80). Geographic distribution. Known from type locality only. Remarks. Mesokalliapseudes crassus was shown to be a protandric hermaphrodite (Drumm and Heard, 2007) and can easily be distinguished from its congeners by its acute rostrum and distinct spinulate process on the antenna. All other congeners have a rounded rostrum. It also appears that M. crassus is more setose and spinose than other members of the genus, especially the antenna, antennules, chela and pereopod 6.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 page 136, DOI: 10.11646/zootaxa.3142.1.1, http://zenodo.org/record/626389