Carinaria lamarcki P?ron and Lesueur 1810

Introduction

This species attains the second largest size (to 220 mm body length) among the six species of Carinaria. The shell is broadly triangular in side view and shares with C. challengeri the lowest shell height to basal length ratio (0.5). The keel is moderately low, extending the length of the adult shell at about the same height. The tail is moderately small and has a low dorsal crest.

Characteristics

1. Body morphology
   1. Eye shape triangular in dorsal view
   2. Tail moderately small, with low crest (see title illustration)
      
2. Shell morphology
   1. Shell laterally compressed and broadly triangular in side view
   2. Shell height about one-half the basal length
   3. Keel moderately well developed, with height increasing gradually with increasing shell growth
      

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      Figure. Stalked visceral nucleus with transparent shell in Carinaria lamarcki, viewed from right side of body. ©

   4. Shell apex with ventrally-directed protoconch
      

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      Figure. Apical portion of shell in Carinaria lamarcki, from right side (left) and close up of protoconch (right). ©

3. Larval morphology (after Thiriot-Quiévreux, 1975)
   1. Brown pigment on the mantle, digestive tube and opercular lobe; digestive gland yellow
      
   2. Velum comprised of six velar arms; each arm is bordered by a thin line of brown pigment and with a terminal small brown patch
      
   3. Larval shell transparent and globular, with oval aperture; low, conical spire; and, two elevated spiral ridges on second whorl, the outer most of which does not extend as far around the shell whorl as the inner one
      
      

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      Figure. Larval shells of Carinaria lamarcki, viewed from the aperture (left), right side, tilted (center), and right side, spire (right). Scanning electron micrographs from Thiriot-Quiévreux (1975; Fig. 1E-G). © 1975 C. Thiriot

References

Seapy, R. R. and C. Thiriot-Quievreux. 1994. Veliger larvae of Carinariidae (Mollusca: Heteropoda) from Hawaiian waters. Veliger 37:336-343.

Thiriot-Qui?vreux, C. 1975. Observations sur les larves et les adulte de Carinariidae (Mollusca: Heteropod) de l'Oc?an Atlantique Nord. Marine Biology 32: 379-388.