| animal phylum comprised of sponges |
| phylum comprised of annelids |
| Main Entry: | crepuscular1 |
| Part of Speech: | adj |
| Definition: | pertaining to twilight, esp. in dimness |
| Etymology: | Latin crepusculum |
| Main Entry: | crepuscular2 |
| Part of Speech: | adj |
| Definition: | appearing or active at twilight |
| Etymology: | Latin crepusculum |
| Usage: | zoology |