The most distinctive feature of the genus is the presence of a large subcutaneous gland that opens by a pore at the posterior end of the mantle between the fins.

Brief diagnosis:

A sepiid ...

• with a pore posteriorly between fins.

1. Funnel
1. Funnel component of locking apparatus with pit-like depression at midpoint of groove.
   
   
2. Mantle
1. Duct from large gland beneath skin on posterodorsal mantle opens posteriorly between fins.


Figure. Posteroventral mantle of S. inermis. The posterior pore in the skin (arrow) is seen ventral to the dark oval patch. Photograph by Mark Norman.

3. Shell
1. Cuttlebone length approximately equal to mantle length.
2. Cuttlebone with posterior spine between fins absent.

Comments

The function of the secretion from the posterior gland is unknown.

Depth range based on 20 specimens in 8 taxa.
Water temperature and chemistry ranges based on 4 samples.

Environmental ranges
  Depth range (m): 1.2 - 160
  Temperature range (°C): 24.821 - 27.572
  Nitrate (umol/L): 1.531 - 2.763
  Salinity (PPS): 34.621 - 35.018
  Oxygen (ml/l): 3.825 - 4.302
  Phosphate (umol/l): 0.269 - 0.300
  Silicate (umol/l): 4.953 - 6.523

Graphical representation

Depth range (m): 1.2 - 160

Temperature range (°C): 24.821 - 27.572

Nitrate (umol/L): 1.531 - 2.763

Salinity (PPS): 34.621 - 35.018

Oxygen (ml/l): 3.825 - 4.302

Phosphate (umol/l): 0.269 - 0.300

Silicate (umol/l): 4.953 - 6.523
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

Barcode of Life Data Systems (BOLD) Stats
                                        

Specimen Records:	18	Public Records:	9
Specimens with Sequences:	22	Public Species:	2
Specimens with Barcodes:	14	Public BINs:	2
Species:	3
Species With Barcodes:	3

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