Cristapseudes exocladum, Drumm & Heard, 2011

DRUMM, DAVID T. & HEARD, RICHARD W., 2011, Systematic revision of the family Kalliapseudidae (Crustacea: Tanaidacea), Zootaxa 3142 (1), pp. 1-172 : 64-69

Cristapseudes exocladum n. sp.

( Figs 40–43 )

Material examined. Holotype: adult female ( MV J15693 ); paratype: female with oostegites, partly dissected ( MV J15692 ), N. Australia, Queensland, South branch mission river, near Weipa; paratype: adult female ( NMV J61792 ), North Australia, Queensland, mouth of Marmoss Creek , near Weipa.

Diagnosis (adult female). Rostrum round. Pleotelson with two terminal plumose setae. Inner flagellum of antennule with four articles; first peduncle article two times as long as broad, ventral surface with one subdistal spiniform seta. Antenna flagellum with six articles; last peduncle article with double row of plumose setae. Labrum complex with four strong cusps. Terminal spiniform seta of mandibular palp short and stout, approximately five times as long as broad. Cheliped: exopodite present, with two plumose setae; basis with one short midventral spiniform seta. Pereopod 1: exopodite present, with two plumose setae; basis with one subdistal ventral spiniform seta. Pereopods 4 and 5 basis very swollen, approximately 1.7 times as long as broad. Pereopod 6 dactylus as long as carpus and propodus combined, with one subterminal seta. Uropod exopodite with 3 articles, last article approximately 2.4 times as long as second article.

Etymology. Exo (Gr.) = out, out of, Klados (Gr.) = branch. The name reflects the presence of exopodites on the cheliped and first pereopod.

Description. Adult female with oostegites. Body length ( Fig. 40A ) approximately 4.3 mm, 5.5 times as long as broad.

Carapace ( Fig. 40A ) as broad as long, 1 pair of mid–lateral and dorsal setae; rostrum rounded.

Pereonites ( Fig. 40A ). Pereonites 4 and 5 longest and subequal, pereonites 1–3 subequal in length, pereonite 6 shortest, all rounded laterally; one pair simple setae on anterior corners (except 1 st pereonite) and on dorsal surface; hyposphaenia present.

Pleonites ( Fig. 40A ) subequal; epimera rounded, with several lateral plumose setae and two or three pair short simple dorsal setae; hyposphaenia present. Pleotelson ( Fig. 46A ) as long as last three pleonites, gently tapering posteriorly to cleft tip, with several short dorsal simple setae and two long terminal plumose setae.

Antennule ( Fig. 40B ). First peduncle article approximately two times as long as broad, with several simple and broom setae on outer margin and several simple setae on inner margin; one subdistal spiniform seta on ventral surface. Second peduncle article with several distal simple and broom setae. Third peduncle article with several distal simple setae. Fourth peduncle article with one simple and one broom seta. Inner flagellum with four articles, distal article with three simple setae. Outer flagellum with nine articles, shorter than peduncle, one aesthetasc each on articles 4, 5, and 7, and four simple and one broom setae on distal article.

Antenna ( Fig. 40C ). First peduncle article with medial extension bearing five plumose setae and one simple seta on outer subdistal margin. Squama with four simple setae. Third peduncle article with one plumose seta on inner margin. Fourth peduncle article as long as first five flagellum articles, with double row of plumose setae, one proximal and one subdistal broom seta. Flagellum with six articles bearing at least one plumose seta on each arti-

Mandibles ( Figs. 40E–G ) Left mandible: incisor process with approximately 13 denticulations; lacinia mobilis with seven denticulations. Right mandible: incisor process with five denticulations. Spine–row with five serrate spiniform setae. Mandibular palp terminating in short and stout spiniform seta, approximately five times as long as broad.

Labium ( Fig. 40H ). Palp with long hair–like setae and terminating in short spiniform seta.

Maxillule ( Fig. 41A ). Inner endite bearing four terminally setulate setae and dense row of hair–like setae on outer and inner margins. Outer endite with 10 long and one short spiniform setae, two subterminal setae and dense row of hair–like setae on outer margin.

Maxilla ( Fig. 41B ). Inner lobe of fixed endite with posterior row of four serrate spiniform setae and with long anterior row of setae. Outer lobe of fixed endite with four serrate and several simple setae; posterior face with one short forked spiniform seta. Inner lobe of moveable endite with several simple and tricuspid setae; outer lobe of moveable endite with three pectinate and one plumodenticulate setae.

Maxilliped ( Fig. 41C ). Basal article fringed with plumose setae on outer margin. First article of palp with two simple setae on inner margin (one long and one short). Last three articles of palp with double row of long plumose setae on inner margin; second palp article with one distal simple seta on outer margin. Endite with several pappose setae along margin, one long simple and several pappose distal setae; two coupling hooks.

Cheliped ( Fig. 41D ). Exopodite present, terminating in two plumose setae. Basis with one midventral spiniform seta, two midventral simple setae and one short ventrodistal simple seta. Merus with one short midventral simple seta and three distal simple setae. Carpus approximately 3.3 times as long as broad, with double row of long, plumose setae, one short middorsal and three simple setae on dorsodistal corner. Propodus robust, approximately 1.3 times as long as broad (excluding fixed finger), with diagonal row of long plumose setae on inner; palm region with several distal simple setae; fixed finger less than one–half length of dactylus; cutting edge with several short spiniform setae interspersed with one to several spinules. Dactylus with three long setae on inner face and several short simple setae on outer face; cutting edge with nine spinules increasing in length distally.

Pereopod 1 ( Fig. 41E ). Exopodite present with two plumose setae. Basis with several simple setae on ventral margin and one short ventral subdistal spiniform seta. Ischium with one simple seta on ventrodistal corner. Merus approximately two times as long as broad, approximately 2.5 times as long as carpus, with several simple setae on ventral margin and outer surface, one ventrodistal spiniform seta, and one short dorsodistal spiniform seta. Carpus short with two ventrodistal and one dorsodistal spiniform setae, outer surface with row of small tubercles and several simple setae. Propodus shorter than carpus, five ventral and two dorsodistal spiniform setae; outer surface with small tubercles and several simple setae; inner surface with one short distal pectinate seta; one broom seta on middorsal margin. Dactylus represented by sensory organ with numerous distal sensory setae and inner surface with two setae (one long and one short).

Pereopod 2 (Fig. 42A). Basis approximately two times as long as broad, two broom setae on dorsal margin, three simple setae on ventral margin. Ischium with one simple ventrodistal seta. Merus same length as carpus, with three simple and one spiniform setae. Carpus approximately 1.4 times as long as broad, with two spiniform setae on ventral margin, two spiniform setae subdistally on outer surface, two simple setae ventrodistally and two simple setae dorsodistally. Propodus same length as carpus, two times as long as broad, with three ventral and two dordodistal spiniform setae, two subdistal spiniform setae on outer surface, one dorsodistal pectinate seta on inner surface and one broom seta midway on dorsal margin. Dactylus long and slender, shorter than basis, with short simple seta proximally on outer surface.

Pereopod 3 (Fig. 42B). Similar to pereopod 2. Carpus with six spiniform setae.

Pereopod 4 (Figs. 42C, D). Basis approximately 1.7 times as long as broad with two simple subdistal setae and two broom setae on proximal outer surface near dorsal margin. Ischium with three simple setae. Merus shorter than carpus with two simple and two spiniform setae. Carpus with six spiniform setae on inner surface and three spiniform setae on outer surface, one long simple dorsodistal seta. Propodus with six inner spiniform setae and six outer spiniform setae increasing in length distally, one dorsodistal spiniform seta, four short pectinate seta on inner surface and three short pectinate setae on outer surface, and one broom seta proximally on dorsal margin. Dactylus represented by a sensory organ with five distal sensory setae.

Pereopod 5 (Figs. 42E, F). Similar to pereopod 4. Merus with three spiniform setae. Carpus with four spini-

Pereopod 6 ( Fig. 43A ). Basis with six long plumose setae on dorsal margin and three plumose and two simple setae on ventral margin, and one proximal broom seta on outer surface. Ischium with two ventrodistal simple setae. Merus nearly same length as ischium, with one ventrodistal simple seta, and two plumose setae on dorsal margin. Carpus approximately 2.3 times as long as merus with four simple setae on ventral margin, four plumose setae on dorsal margin, and one subdistal simple seta. Propodus with three outer spiniform setae and approximately 15 inner bipectinate setae. Dactylus approximately same length as carpus and propodus combined, with one subterminal seta.

Uropod ( Fig. 43C ). Basal article approximately 2.2 times as long as broad, with three subdistal simple setae and one spiniform seta on inner distal corner. Exopodite with short basal article with one long simple seta followed by two longer articles, the last article approximately 2.4 times as long as second article and terminating in four simple setae. Endopodite with approximately 20 articles (exact number unknown due to incomplete fusion in some articles).

Male. Unknown.

Geographic distribution. Known from northern Australia, near Weipa only (Fig. 1, number 15).

Remarks. Cristapseudes exocladum n. sp. is similar to C. unicus in having the first antennular article armed with only a single spiniform seta but is distinguished from it and the other members of the genus by the presence of an exopodite on both the cheliped and first pereopod.

Figures

FIGURE 40. Cristapseudes exocladum n. sp., female paratype with oostegites. A, dorsal view of body; B, antennule (ventral);

FIGURE 41. Cristapseudes exocladum n. sp., female paratype with oostegites. A, maxillule; B, maxilla; C, maxilliped; D, cheliped (outer); E, pereopod 1 (outer). Scale bars: A = 0.03 mm; B = 0.05 mm; C = 0.1 mm; D, E = 0.2 mm.

FIGURE 43. Cristapseudes exocladum n. sp., female paratype with oostegites. A, pereopod 6 (outer); B, pleopod; C, uropod. Scale bars: A, B = 0.1 mm; C = 0.05 mm.

FIGURE 46. A. Kalliapseudes quadrirobustirostris n. sp., male antennule. B. Kalliapseudes gutui n. sp., male antennule. C. Kalliapseudes quadrirobustirostris n. sp., pereopod 1. D. Kalliapseudes gutui n. sp., cheliped exopodite. E. Kalliapseudes langi, pereopod 1 modified after Guţu (2006). F. Kalliapseudes langi, dorsal view of body modified after Guţu (2006). G. Kalliapseudes quadrirobustirostris n. sp., dorsal view of body. H. Kalliapseudes mauritanicus, pereopod 1. I. Kalliapseudes quadrirobustirostris n. sp., pereopod 1. J. Kalliapseudes mauritanicus, female antennule. K. Kalliapseudes magnus, female antennule.