Catapagurus cunhai, Nucci, Paulo Ricardo & Melo, Gustavo Augusto Schmidt De, 2012

Nucci, Paulo Ricardo & Melo, Gustavo Augusto Schmidt De, 2012, A new species of Catapagurus A. Milne-Edwards (Crustacea: Decapoda: Anomura: Paguridae) from Brazil, with a key to the western Atlantic species, Zootaxa 3499, pp. 81-85 : 84-85

Catapagurus cunhai n. sp.

(Figs. 1,2)

Material examined. Ceará, Brazil. Holotype: male 4.2 mm, Canopus Bank, off Fortaleza, Ceará ( MZUSP 25095). Paratypes: 7 males (4.0 mm, 3.8 mm, 3.8 mm, 3.8 mm, 3.7 mm, 2.4 mm, 2.4 mm); 11 females (3.0 mm, 3.0 mm ovig., 2.9 mm ovig., 2.9 mm, 2.9 mm ovig., 2.9 mm, 2.8 mm, 2.8 mm ovig., 2.8 mm, 2.7 mm ovig., 2.7 mm ovig.), Canopus Bank, off Fortaleza, Ceará ( MZUSP 25096).

Description. Shield slightly to distinctly broader than long; anterior margin between rostral lobe and lateral projections concave; anterolateral margins sloping; dorsal surface with few scattered fine setae. Rostral lobe broadly rounded, not reaching level of lateral projections. Lateral projections broadly triangular, each usually terminating in marginal spinule.

Ocular peduncles short, corneal diameter 0.4–0.5 peduncular length. Ocular acicles narrowly triangular, slender, reaching approximately bases of corneas, with acute tips; widely separated.

Antennular peduncles overreaching distal margins of corneas by 0.2 length of penultimate segments. Last segment with tuft of long fine setae at dorsodistal margin and several short setae on dorsal face.

Antennal peduncles overreaching distal margins of corneas by 0.3–0.6 length of last segments. Fourth and fifth segments with few scattered short setae. Third segment with few setae on base of small ventrodistal spine. Second segment with produced dorsolateral distal angle, reaching approximately midlength of fourth peduncular segment; dorsomesial distal angle with prominent spine. First segment covered by anterolateral margin of shield in dorsal view, with small spine at dorsolateral distal angle. Antennal acicles overreaching corneal margins by 0.3–0.4 acicular length. Antennal flagella long, overreaching ambulatory legs and chelipeds.

Right cheliped long, moderately slender. Dactyl 0.6–0.8 length of palm; dorsal surface smooth; dorsomesial margin weakly delimited and with tufts of scattered irregular (in size) setae; cutting edge with 1 large tooth proximally and row of very small fused calcareous teeth from midlength to distal region; fixed finger with sparse tufts of setae, cutting edge with 1 large tooth and row of small calcareous teeth proximally. Palm 0.9 to approximately equaling length of carpus; dorsomesial margin not delimited, rounded surface with irregular row of minute spinules and tufts of setae. Carpus approximately equal to length of merus; dorsomesial margin with irregular row of small spines and sparse tufts of setae, dorsodistal margin unarmed, dorsal surface with small tubercles, dorsolateral margin indistinctly delimited, ventral surface with covering of setae. Merus with scattered bristles on dorsal and mesial surfaces; ventrolateral margin with row of spines increasing in size distally; ventral surface setose. Ischium unarmed. Coxae each with prominent spine at ventromesial distal angle.

Left cheliped slender, shorter than right. Dactyl approximately as long as palm; dorsal surface with scattered setae, terminating in corneous claw; entire cutting edge with tiny corneous teeth. Palm approximately 0.7 length of carpus; dorsomesial and dorsolateral margins not distinctly delimited, surfaces with scattered setae, longer on mesial face than on lateral face; fixed finger with scattered long setae; cutting edge with minute calcareous teeth, interspersed with tiny corneous teeth, terminating in corneous claw. Carpus as long as or slightly shorter than merus; dorsomesial and dorsolateral margins each with irregular row of spines, smaller on dorsolateral than on dorsomesial margin; dorsal surface with scattered small granules; mesial and ventral surfaces with scattered long setae, lateral surface with few small setae. Merus with scattered stiff setae on dorsal, mesial and lateral faces; ventromesial distal angle with strong spine; ventrolateral margin with irregular row of spines; ventral surface with covering of long setae.

Second and third pereopods similar in both size and shape (in the holotype the third left is slightly shorter than the second left, probably regenerating). Dactyls not blade-shaped, 0.1–0.2 longer than propodi, dorsal margins each with row of moderately long stiff setae or bristles; mesial and lateral faces with scattered moderately long setae; ventral margins each with row of bristles; mesial and lateral faces with few scattered setae; ventral margins each with row of stiff setae or bristles. Propodi approximately twice length of carpi; dorsal margins each with row of few bristles. Carpi approximately 0.4 length of meri; dorsal margins each with row of very small spines, with or without a few bristles; dorsodistal angle with 1–3 spines. Meri with few bristles on dorsal margins; large specimens with row of small spines on ventrolateral margin and 1 spine at ventrolateral distal angle of second pereopod. Fourth pereopods with preungual process not exceeding tip of claw. Fifth pereopods not chelate.

Males with right coxa of fifth pereopod bearing moderately long right sexual tube directed toward exterior but not curved dorsally over abdomen.

Sternite of third pereopods with very broad anterior lobe, semirectangular, with long setae on anterior margin. Telson with triangular posterior lobes separated by broad median cleft and with few stiff setae. Etymology. This new species is named for Dr. Carlo Magenta da Cunha, an enthusiastic malacologist, who has

provided excellent material for the study of hermit crabs from Brazil.

Distribution. Known only from the type locality, Canopus Bank, off Fortaleza, Ceará State, Brazil. The material was collected between 350 and 400 m.