Mesokalliapseudes crassus ( Menzies, 1953 )

DRUMM, DAVID T. & HEARD, RICHARD W., 2011, Systematic revision of the family Kalliapseudidae (Crustacea: Tanaidacea), Zootaxa 3142 (1), pp. 1-172 : 136

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.

Figures

FIGURE 17. Hemikalliapseudes makellus, female with oostegites. A, pereopod 3 (outer view); B, pereopod 4 (outer view); C, pereopod 5 (inner view); D, pereopod 6 (inner view). Scale bars = 0.1 mm.

FIGURE 18. Hemikalliapseudes makellus, female with oostegites (A), pleopod; adult male (B–G). A, pleopod; B, dorsal view of body; C, antennule; D, antenna; E, cheliped (outer view); F, chela (outer view); G, pereopod 1 (inner view). Scale bars: A, D = 0.05 mm; B = 0.4 mm; C, G = 0.2 mm; E = 0.1 mm.

FIGURE 19. Hemikalliapseudes makellus, adult male. A, pereopod 1 (distal, outer view); B, pereopod 6 (outer view); C, left mandibular palp; D, right mandibular palp. Scale bars: B = 0.1 mm; C = 0.05 mm.

FIGURE 20. A. Monokalliapseudes schubarti, pereopod 6 modified after Lang (1956a). B. Kalliapseudes syntresis n. sp., pereopod 6. C. Cristapseudes omercooperi, antennule. D. Cristapseudes exocladum n. sp., labrum. E. Cristapseudes siamensis, female and male first antennule peduncle article modified after Guţu and Angsupanich (2005). F. Cristapseudes omercooperi, pereopod 5. G. Kalliapseudes primitivus, pereopod 5. H. Kalliapseudes magnus, antenna peduncle. I. Mesokalliapseudes crassus, antenna peduncle. J. Phoxokalliapseudes n. gen. gobinae comb. nov., female chela. K. Mesokalliapseude quadriflagellata., A, female chela. L. Kalliapseudes bamberi n. sp., pereopod 4. M. Transkalliapseudes spinulata, pereopod 4.

FIGURE 80. Distribution map of species belonging to the genus Mesokalliapseudes.