Colopisthus ronrico, MOORE & BRUSCA, 2003

MOORE, WENDY & BRUSCA, RICHARD C., 2003, A monograph on the isopod genus Colopisthus (Crustacea: Isopoda: Cirolanidae) with the description of a new genus, Journal of Natural History 37 (11), pp. 1329-1399 : 1364-1371

Colopisthus ronrico new species

(figures 23–27)

Synonymy. Colopisthus parvus Menzies and Glynn, 1968: 41 , figures 16, 17 (misidentification; not C. parvus: Richardson, 1902 ).

Type material examined. (1) H  , male ( USNM 285286 ) and two female paratypes ( USNM 285287 ): Puerto Rico, north coast; exact collection locality and collector unknown; donated by Ernst Williams. (2) Paratype, female ( USNM 128315 ): Puerto Rico, Arecibo, intertidal, collected by Menzies and Glynn.

Diagnosis. Lateral margins of cephalon and pereonite 1 with crenulations. Coxae 4–7 visible dorsally. Pleon with one free pleonite and two fused pleonites. Antenna 1 flagellum two-articulate. Antennae 2 flagellum five-articulate in females, six-articulate in males. Maxilliped palp articles 2 and 3 partially fused. Maxilliped endite with four circumplumose setae and one coupling seta. Mandible spine row with eight large spines. Carpus of P-5 with one biplumose seta on anterior-distal margin; P-6 with two biplumose setae on anterior-distal margin; P-7 with four biplumose setae on anterior-distal margin. Pl-3 exopod with complete transverse suture.

Description of female

Head. Lateral margins of cephalon and pereonite 1 with crenulations. Crenulations are weak on female (visible in lateral view).

Antennae. Both antennae with visible shingle sculpturing under light microscope. Antenna 1 peduncular articles 1–4 with slender and biplumose setae; flagellum twoarticulate, first article much longer than distal article; both articles with slender setae and jointed aesthetascs. Antennae 2 peduncular articles 2–5 with slender and biplumose setae; flagellum five-articulate, all with cluster of slender setae in the anterior-distal region.

Mouthparts missing; previously dissected, presumably by Menzies and Glynn (1968).

Pereopods 1–3. Ischium with one or two stout setae on inferior margin and one stout seta near inferior-distal angle; P-3 with one molariform seta near inferiordistal angle. Merus with one or two molariform setae on inferior margin and a cluster of stout setae on inferior-distal and superior-distal angles. P-3 carpus subtriangular, inferior margin much longer than superior margin; with cluster of stout setae on inferior distal angle; propodus with two complex setae and no connate spines; superior distal angle with one slender seta and two biplumose setae. Pereopod 4 missing.

Pereopods 5–7. Ischium with two clusters of stout setae on inferior margin; P-6 and P-7 with biplumose seta at superior-distal angle. Carpus of P-5 with one biplumose seta on anterior-distal margin, P-6 with two biplumose setae on anteriordistal margin and approximately two long biplumose setae at superior-distal angle; P-7 with four biplumose setae on anterior-distal margin and approximately three long biplumose setae at superior-distal angle. Propodus inferior-distal angle with one stout and one reduced complex seta; posterior-distal margin with one stout seta; superior-distal angle with one stout, one slender and one biplumose seta.

Pleopods. Pl-1 to Pl-3 peduncle with three coupling setae on medial margin. Pl-2 to Pl-5 lateral margin of peduncle with one stout seta. Pl-3 to Pl-5 exopod with complete transverse suture. Pl-1 to Pl-4 endopod with approximately three to five PMS; exopod with approximately 9–12 PMS. Pl-5 endopod subovate, without setae; exopod with approximately seven PMS.

Uropod. Endopod with slender and palmate setae, two robust setae on medial margin and one robust seta on lateral margin; apex broadly rounded with approximately four long slender setae. Exopod with slender setae and two robust setae on medial margin and one robust seta on lateral margin; apex rounded, with approximately four long slender setae; lateral margin with a continuous row of short slender setae; proximal-lateral margin with dorsal fold.

Description of male

As described for female except as follows.

Coxae 3–7 visible dorsally. Crenulations on lateral margin of cephalon and pereonite 1 more pronounced than in female.

Antennae. Antenna 1 peduncular article 1 with one slender, jointed seta, peduncular articles 2–4 with slender and biplumose setae; flagellum three-articulate. Antennae 2 peduncular article 3 with slender setae only, articles 4 and 5 with biplumose and slender setae; flagellum six-articulate.

Maxilliped. Endite with four circumplumose setae and one coupling seta. Palp article 1 without setation; articles 2 and 3 partially fused, lateral and medial margins with fine and jointed, slender setae; article 4 with one jointed, slender seta on distolateral angle and four uniserrate and approximately two slender setae on distal medial angle; terminal article width and length subequal and with approximately five jointed slender and two uniserrate apical setae.

Maxillae. Maxilla 1 lateral lobe with one stout, seven forked and three uniserrate setae; medial lobe with one small plumose and three stout biplumose setae. Maxilla 2 outer lobe with three uniserrate and fine setae on lateral margin; medial lobe with two uniserrate setae; gnathal lobe with one slender seta at base (below outer lobe), apical margin with one large circumplumose and five stout biplumose setae, fine setae on lateral margin.

Mandible. Spine row with eight large spines; molar process with approximately 11 small acute marginal spines; proximal palp article without setation; middle article with three slender, six biserrate and three unequally biserrate setae; distal article with seven biserrate setae.

Pereopods 1–3. P-2 ischium with molariform seta near inferior-distal angle. Merus with distal margin deeply incised (notched) on anterior surface. P-1 carpus with three connate spines on inferior margin. Propodus with complex setae and connate spines on inferior margin as figured; P-1 with two complex setae and four connate spines; P-2 with two complex setae and two or three connate spines, P-3 with one complex seta one stout seta and no connate spines; superior distal angle with two slender setae or two biplumose setae.

Pereopods 4–7. Ischium with two or three clusters of stout setae on inferior margin; P-5 with biplumose seta at superior-distal angle. Carpus of P-7 with five biplumose setae on anterior-distal margin. Propodus of P-4 superior-distal angle with one stout, one slender and one biplumose seta; P-5 to P-7 superior-distal angle with one stout and two biplumose setae.

Pleon. Pl-2 endopod with approximately seven PMS; exopod with approximately 13 PMS. Penes curved slightly inward distally.

Uropod. Endopod apex with approximately five long slender setae; exopod apex with approximately five long slender setae.

Distribution This species is known only from the intertidal shores of Puerto Rico.

Etymology

This species is named after Ronrico rum, one of the smoother rums produced in the type region ( Puerto Rico) .